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Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [3];  [3];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
  4. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)

X-ray microdiffraction and scanning electron microscopy studies reveal 10 M martensitic structure with a highly correlated multiscale twin hierarchy organization in NiMnGaFeCu shape memory alloys. In this paper, high compatibility is found at the twin interfaces resulting in a highly correlated twinned lattice orientation across several laminate levels. The lattice unit cell is described as monoclinic I-centered with a = 4.28 Å, b = 4.27 Å, c = 5.40 Å, γ = 78.5°. The modulation is found parallel to the b axis. Finally, thin tapered needle-like lamellae and branching are observed near the twin boundaries.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Contributing Organization:
Carnegie Inst. of Washington, Argonne, IL (United States)
Grant/Contract Number:
NA0001974; FG02-99ER45775; AC02-06CH11357
OSTI ID:
1286685
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 87; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Magnetocaloric effect near room temperature in quintenary and sextenary Heusler alloys journal October 2019